libyaz0.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# libyaz0
# Version 0.1
# Copyright © 2017 MasterVermilli0n / AboodXD

# This file is part of libyaz0.

# libyaz0 is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# libyaz0 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

try:
    import pyximport

    pyximport.install()
    import yaz0_cy as yaz0

except:
    import yaz0


def IsYazCompressed(src):
    return src[:4] in [b'Yaz0', b'Yaz1']


def decompress(inb):
    isYaz = IsYazCompressed(inb)

    if isYaz:
        return yaz0.DecompressYaz(inb)

    else:
        raise ValueError("Not Yaz0 compressed!")


def compress(inb, unk=0, level=9):
    data = yaz0.CompressYaz(inb, level)

    result = bytearray(b'Yaz0')
    result += len(inb).to_bytes(4, "big")
    result += unk.to_bytes(4, "big")
    result += bytes(4)
    result += data

    return result